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The initial warning signs of a concussion are often present within moments of impact, forcing athletes to make a quick decision.

It's an easy risk-versus-reward scenario. There is simply no upside for those who stay silent and continue on, gambling that further contact will not do long-term damage.

"Educating athletes so they know when they have a concussion is very important," said Dr. Barry D. Jordan, who is the director of the Brain Injury Program at Burke Rehabilitation Hospital in White Plains and the chief medical officer for the New York State Athletic Commission. "They need to know ...